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RE: [xsl] Integrated sort using different elements

2009-02-19 10:31:28
From: G. Ken Holman [mailto:gkholman(_at_)CraneSoftwrights(_dot_)com]
Sent: Thursday, February 19, 2009 10:20 AM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] Integrated sort using different elements

At 2009-02-19 09:09 -0600, Quinn Dombrowski wrote:
I'm trying to figure out a way to sort by one of multiple elements,
with descending priority.

You create a select expression that chooses the element you want in
the presence or absence of other items.

I'm working with a TEI bibliography, and there's no single element
that all the entries have. Ideally, I'd like to sort by
monogr/author; but when that's not possible, by analytic/author; if
not that, monogr/editor; then monogr/title; and so on down the line.

In XSLT 2.0, choose the first item in a sequence of many items,
priority indicated by the order of your sequence:

<xsl:sort select="
  ( monogr/author, analytic/author, monogr/editor, monogr/title )[1]"/>

In XSLT 1.0 you might do something along the lines of:

<xsl:sort select="
   monogr/author |
   self::*[not(monogr/author)]/analytic/author |
   self::*[not(monogr/author | analytic/author)]/monogr/editor |
   self::*[not(monogr/author | analytic/author |
monogr/editor)]/monogr/title"/>

I think for XSLT 1.0 you can simplify that select to:

<xsl:sort select="(monogr/author|analytic/author)[1]"/>

which should also work in XSLT 2.0 without using a sequence.


Andy.


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